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 Post subject: Book 8, Question 100, Page 124Posted: Mon May 09, 2011 9:45 am

Joined: Fri Mar 18, 2011 12:27 pm
Posts: 17
x = y^2, what if the value of y - x?

1. x = 4
2. x + y = 2

The answer is C but I got A.

Statement 1 I plugged 4 in for x.
4 = y ^2
Square both sides and got 2.
Therefore, I know that X = 4 and y = 2
If I did that correctly, statement 1 is sufficient
Answers are down to A and D

Statement 2 is not sufficient on its own-- making the answer A.

Where did I go wrong?

Thank you!

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 Post subject: Re: Book 8, Question 100, Page 124Posted: Mon May 09, 2011 4:15 pm

Joined: Thu Feb 12, 2009 6:32 pm
Posts: 497
from (1)

4 = y^2

so y = 2 or y = -2

y - x = 2 - 4 = - 2 y - x = -2 - 4 = - 6

or

y - x = -2 - 4 = -6 y - x = -6 - 4 = - 10

so (1) is not sufficient

with (1) and (2)

x = 4 and y = 2 - x

so y = 2 - 4 = - 2 y - x = - 2 - 4 = - 6 so (1) and (2) are sufficient

Veritas Help

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 Post subject: Re: Book 8, Question 100, Page 124Posted: Mon May 09, 2011 4:23 pm

Joined: Fri Mar 18, 2011 12:27 pm
Posts: 17
I got it. Thank you

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